At this point, Angor still did not realize that getting a mere glimpse of truth and stepping onto the path of truth was completely different.
Wizards who had already found the path of truth would never tell others about it since every wizard must find his or her own path. A glimpse of truth, however, meant "the will to create", not finding new spell combinations.
Creating something and using it, in reality, was one of the foremost qualities for finding the path of truth. Angor created a cantrip called "Dust" and utilized it at a proper point. The cantrip did not really do anything to Dripping River. However, it was how Angor created the spell in the first place, which really caught Sunders' attention.